Hmm. Lots of interesting info. Now I wonder if my turbine housing is right or not. The were both advertised as a "1.15 van housing and high flow outlet" when I bought them iirc (and we know from above I may not). I don't remember it saying anything about a SD. I guess I didn't realize there was a difference between van and Super Duty/38r turbo parts. My down pipe is the exact same one that was on it with the stock turbo. Sounds like I'm in over my head in this one, but I will hang around to learn a thing or two.
-Aaron